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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance at beginning of the period | $ 3,575 | $ 3,325
Net cash flows | 447 | 195
New leases | 16 | 133
Tax shield on tax equity financing |  | (35)
Dividends declared | 107 | 64
Foreign exchange impact | 5 | (42)
Other | 0 | (65)
Balance at end of the period | 4,150 | 3,575
Long-term debt and lease obligations |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance at beginning of the period | 3,212 | 3,267
Net cash flows | 133 | (70)
New leases | 16 | 133
Tax shield on tax equity financing |  | (35)
Dividends declared | 0 | 0
Foreign exchange impact | 5 | (42)
Other | (5) | (41)
Balance at end of the period | 3,361 | 3,212
Exchangeable securities (Note 25) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance at beginning of the period | 326 | 0
Net cash flows | 400 | 350
New leases | 0 | 0
Tax shield on tax equity financing |  | 0
Dividends declared | 0 | 0
Foreign exchange impact | 0 | 0
Other | 4 | (24)
Balance at end of the period | 730 | 326
Dividends payable (common and preferred) |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |
Balance at beginning of the period | 37 | 58
Net cash flows | (86) | (85)
New leases | 0 | 0
Tax shield on tax equity financing |  | 0
Dividends declared | 107 | 64
Foreign exchange impact | 0 | 0
Other | 1 | 0
Balance at end of the period | $ 59 | $ 37

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44D&doctype=Standard -URIDate 2019-03-27 + Details
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